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Old 12-11-2010, 06:30 PM   #1
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Default Miss at idle and 60MPH. Need help please.

My truck is a 1995 F150, 4.9L, 5 speed. I have a nice little miss at idle, it can be felt through the stick shift and in the truck. Also, at 55-60MPH I get a major miss, the whole truck jerks as it looses power. It seems to only happen when the gas pedal is pressed at a certain angle, just enough to keep it cruising at that speed. Let off completely and it stops or go to 50% throttle or more and it completely stops. Seems to have plenty of power and it just passed the emissions sniffer for inspection.

Codes are:
522 - Neutral park switch. Likely due to a 5 speed.
212 - Spout connector grounded or disconnected. Likely because I set the timing.
327 - Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor/electronic vacuum regulator (EVR)

Unrelated to this problem, I have changed/done the following:

Ignition module
Pickup coil. Just the pickup, not the whole dizzy
Cap, rotor, wires.
Numerous vacuum lines replaced
Ignition timing set at 10* and up to 14* without change.
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Old 12-11-2010, 09:33 PM   #2
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Setting timing should have noting to do with spout code, is your spout connected? Its the gray thing that goes into a small plug in, and the idle and 60mph miss might be an injector.
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Old 12-11-2010, 09:58 PM   #3
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Originally Posted by dirtcrew51m View Post
Setting timing should have noting to do with spout code, is your spout connected? Its the gray thing that goes into a small plug in, and the idle and 60mph miss might be an injector.
Yes, the spout is connected fine. I will check the wiring in that area, see if something is shorting out. I thought about an injector as well, but it doesn't make sense that it only acts up at 55-60MPH.
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Old 12-11-2010, 10:21 PM   #4
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If it's also missing at idle, let it idle at normal temp and unplug one spark plug wire at a time. If you have a miss, one cylinder won't affect the idle. From there, you just need to figure out if it's lack of spark, or lack of fuel.
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Old 12-12-2010, 03:03 AM   #5
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If it's also missing at idle, let it idle at normal temp and unplug one spark plug wire at a time. If you have a miss, one cylinder won't affect the idle. From there, you just need to figure out if it's lack of spark, or lack of fuel.
Not necessarily, I need to find the source of the codes first. The DPFE was acting up on a friends 4.0L explorer and my 4.6L mustang and it caused a miss much like this. I definitely have something to look at with the spout connector since it's not supposed to fire when setting the timing.
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Old 02-15-2012, 11:09 PM   #6
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Could be the catalytic converter if it does it after warmed up...
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Old 10-11-2012, 01:17 AM   #7
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JC316 Did you ever find out what was the problim. My 1993 dose the very same thing and I have been trying to fix it for 6 months, I tried Ford when I ran out of ideas but they were not any help, they were stumped to.
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Old 10-11-2012, 01:17 AM
 
 
 
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